Method for producing NDI/MDI based polyurethane micropore elastomer

A technology of microcellular elastomer and polyurethane, applied in the field of preparation of polyurethane microcellular elastomer, can solve the problem of high dynamic fatigue deformation value

Active Publication Date: 2011-01-19
上海凯众材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to aim at the defect of high dynamic fatigue deformation value existing in the existing MDI-based microcellular elastomer technology, and propose a kind of NDI / MDI for optimizing the dynamic fatigue performance of MDI-based microcellular elastomer Preparation method of base polyurethane microcellular elastomer

Method used

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  • Method for producing NDI/MDI based polyurethane micropore elastomer
  • Method for producing NDI/MDI based polyurethane micropore elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Polycaprolactone with a molecular weight of 2000 reacts with NDI at 120-140°C to obtain a prepolymer with an -NCO content of 8.2%——W NDI

[0026] Polycaprolactone with a molecular weight of 2000 reacts with MDI at 70-90°C to obtain a prepolymer with an -NCO content of 8.2%——W MDI

[0027] Take W MDI :W NDI = 5:1 Mix thoroughly at 90°C for later use.

[0028] The cross-linking agent component is mainly 1.4 butanediol, and the auxiliary components include: blowing agent water, commercially available Dabco33Lv of the catalyst, commercially available DC 193 of the surfactant, etc., wherein the auxiliary components account for the total amount of the cross-linking agent 5%; use a low-pressure foaming machine, mix the prepolymer mixture and the crosslinking agent component according to the ratio of the isocyanate index to 100%, inject the reaction feed liquid into a mold at 90°C, and manufacture microcellular elastomer products (such as figure 1 ) and a test piece (150×1...

Embodiment 2

[0031] Take W MDI :W NDI = 4:1 Mix thoroughly at 90°C for later use. Others are the same as embodiment 1.

Embodiment 3

[0033] Take W MDI :W NDI = 3:1 Mix thoroughly at 90°C for later use. Others are the same as embodiment 2.

[0034] Table 1: Dynamic fatigue properties of microcellular elastomers prepared by comparative examples 1-2 and examples 1-3

[0035] serial number

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Abstract

The invention discloses a preparation method for an MDI / NDI based polyurethane microporous elastomer, and aims to solve the problem of high fatigue deformation value of the polyurethane microporous elastomer in the prior MDI technology. The preparation method comprises the steps of preparation of prepolymer, and mixing, pouring and post curing of the prepolymer, and the like. A product prepared by the method is used as a high-intensity damping element for bearing dynamic fatigue, such as a damping element of a vehicle such as an automobile and the like, a bridge damping block, and the like, so as to optimize the dynamic fatigue property of the microporous elastomer by the MDI technology.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane microcellular elastomer, in particular to optimizing the dynamic fatigue performance of an MDI-based microcellular elastomer. Background technique [0002] Due to the excellent static and dynamic mechanical properties of polyurethane microcellular elastomers, it is especially used in rocking vibration and damping systems. Their industrial importance is due to their good mechanical properties combined with cheap and convenient processing methods. Using various chemical structural components in different mixing ratios can produce products with widely different mechanical properties and processability. As we all know, 1.5-NDI-based microcellular elastomers have excellent performance, and have advantages that other isocyanate-based products cannot match in terms of dynamic fatigue performance and fatigue deformation performance, so they have been used as high-end products in special fields. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/76C08G101/00C08G18/10C08G18/48
Inventor 杨颖韬侯瑞宏刘鸿慈
Owner 上海凯众材料科技股份有限公司
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